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Tried the following:

db = db.getSiblingDB('qa');
db.foo.save({b:[1, 2, 3, 4]});
db.foo.find({}, {"b.2":1});

Result is an empty array:

{ "_id" : ObjectId("4f5f95b285228a256ddccf7e"), "b" : [ ] }

Is that supposed to work, or are we just not detecting the unsupported syntax?

Since it has to be quoted anyway, it would be nicer if this worked:

> db.foo.find({}, {"b[2]":1});
{ "_id" : ObjectId("4f5f95b285228a256ddccf7e") }

duplicates

SERVER-1831 Using dot-notation to field-select an element by position from a nested Array fails to return the element

is related to

SERVER-4589 aggregation: need an array indexing operator